Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 23,245	$ 15,104	$ 64,649	$ 41,756
Unrealized (loss) gain on hedging activities, net of tax	(19)	422	31	970
Foreign currency translation adjustments, net of tax	(34,388)	40,310	5,405	11,764
Defined benefit pension and other postretirement plans, net of tax	1,988	(66)	3,318	1,490
Comprehensive income (loss)	$ (9,174)	$ 55,770	$ 73,403	$ 55,980